Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Fine Structure of Pollen Tubes Grown in Vitro
The growth in pollen tubes is exclusively restricted to the tip. Cytochemical analysis reveals the pollen tip zone to be rich in RNA and protein. This zone has numerous vesicles and an elaborate network of smooth membranes. The vesicles appear to rise from the ends of dictyosome cisternae. They coalesce with one another and ultimately contribute their membrane and contents to the compartmented cap covering the growth zone at the tip. The cap and the vesicles contain pectin and the RNA resides in the smooth membranes.
In the region behind the tip the tube contains those organelles present in pollen before germination, as well as numerous amyloplasts. The tube wall is thin (tubes growing in pistil have complex wall). Cellulose is the primary wall component. The cytoplasm of pollen tubes growing in vitro lack microtubules. EM shows that the generative cell is surrounded by its own distinct wall and the cytoplasm is different from the grain proper. It contains a small number of poorly developed organelles which possess little storage material.
Define Requirements and Recommended Dietary Allowances (RDA)? What do we mean by requirements and RDA? The requirement level is the amount of nutrient needed to be absorbed to
Theoretically you can build a light microscope with unlimited magnification, but can you build a light microscope with unlimited resolution? Why or why not? (Hint: what really cont
Q. Explain the nucleolus? The nucleolus is an optically and a small dense region in the interior of the cell nucleus. It is made of ribosomic proteins and RNA (rRNA). One nucle
Hexokinase, that catalyzes the first irreversible step of glycolysis, is inhibited by glucose 6-phosphate. Thus when PFK is inhibited and fructose 6-phosphate builds up an
What are the major conventional symbols and signs used in genetic family trees? In the genetic family trees the male sex is usually represented by a square and the female by a
Explain the Health Economics? Health economics concentrates on application of the principles and rules of economics in the sphere of health. In broad terms, it includes analysi
Determine the representation of the Nucleus In all eukaryotic cells, the nucleus represents the most prominent and conspicuous organelle of the cell, and is generally seen as a
Define about Selenoproteins P and W? The third group comprises of selenoprotein P, an extracellular constituent with multiple selenocysteine molecules. This has an antioxidant
Micro Debrider: long , it's tip as hand spreader, not smooth and resemble H file. - These instruments have a hedstrom cutting configuration with a standard 0.02 taper and
Q Is the tubular-dorsal nervous system of chordates associated to radial or lateral symmetry? How does that explain the complexity level of the nervous system reached by the verteb
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd